220021221102021 has 6 divisors (see below), whose sum is σ = 317808430480710. Its totient is φ = 146680814068008.

The previous prime is 220021221101887. The next prime is 220021221102029. The reversal of 220021221102021 is 120201122120022.

It is a happy number.

220021221102021 is a `hidden beast` number, since 2 + 200 + 212 + 211 + 0 + 20 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 139089354768225 + 80931866333796 = 11793615^2 + 8996214^2 .

It is not a de Polignac number, because 220021221102021 - 2¹³ = 220021221093829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220021221101985 and 220021221102003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220021221102029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12223401172326 + ... + 12223401172343.

It is an arithmetic number, because the mean of its divisors is an integer number (52968071746785).

Almost surely, 2^{220021221102021} is an apocalyptic number.

It is an amenable number.

220021221102021 is a deficient number, since it is larger than the sum of its proper divisors (97787209378689).

220021221102021 is a wasteful number, since it uses less digits than its factorization.

220021221102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24446802344675 (or 24446802344672 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 220021221102021 its reverse (120201122120022), we get a palindrome (340222343222043).

The spelling of 220021221102021 in words is "two hundred twenty trillion, twenty-one billion, two hundred twenty-one million, one hundred two thousand, twenty-one".